1 hour = 60 minutes, 1 minute = 60 seconds so 1 hour = 60*60 seconds.
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60 multiplyed by 60 is.... WHAT???
1 hour/40 secs = 3600 sec/40 sec = 90 of them.
2 hour = 3600 sec 5 min = 300 sec total sec in 2hr&5min= 3900
Let's put it this way, 1 hour is 3600 seconds, so your answer is 5/18 of an hour, ie 16 min 40 sec.
100 meters in 12 seconds is 18.64 miles per hour.